A novel optical coating devoted to reduction of CRT panel specular reflection has been developed using the sol-gel route. The sol-gel antireflective (AR) coating is made from tantalum and silicon oxide-based solutions. First layer is an hybrid material based on polymeric mixture of tantalum with silicon oxide. Second and third layers are respective containing tantalum oxide and silica polymeric matrix, since they correspond to the high and low index thin film in the optical stack. Sol-gel synthesis has been carried out starting from cheap precursors in order to produce metallic alkoxide-based solution, each one suitable for liquid- deposition technique use such as dip or spin-coating. After layer deposition, a curing step is required. Both thermal and UV-curing could include layer densification and generate final coating properties. UV-curing is performed using short wavelength irradiation and thermal baking step does not exceed 150 degrees C temperature. CRT front panel prototypes have been produced with sol-gel AR-coat for test measurements. The process time including deposition by dip- coating and curing, is about one hour. This three-layer antireflective coating has been optimized to offer scratch- resistance, easy-clean and broadband antireflection properties on CRT panels.
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